The book covers the basic concepts and fundamental laws of electrical circuit theory; analysis and applications of series, parallel and series - parallel resistive circuits; mesh and nodal analysis; network theorems that operates on Direct Current. It tackles the topics in a simplified manner that could be easily understood by students and individuals that want to explore and learn the basic principles of Direct Current (DC) circuits. Containing sample problems solved with detailed solutions coupled with step by step explanations and several practice problems at the end of each topics makes the book a self sufficient guide in exploring each basic topics in the field of Direct Current (DC) circuits.